NASA
Nasa Star Child: Star Child
StarChild from NASA defines and describes the Solar System in a simple and easy-to-understand manner. The website is broken down into two versions for the student, grade school and junior high.
Physics4kids
Physics 4 Kids: Mechanics and Motion
Motion is one of the key topics in physics. Everything in the universe moves. It might only be a small amount of movement and very very slow, but movement does happen. Don't forget that even if you appear to be standing still, the Earth...
Physics4kids
Physics 4 Kids: Where Traditional Physics Stops
We're about to move into the modern age of physics. In the early 1800's, scientists began examining the basis of matter, space, and time. Sometimes it gets very confusing, but the big idea is that Newton's physics describe about 90% of...
Other
Sky Server: About Astronomy
This site from SkyServer provides the history of astronomy as well as links to mapping the sky, galaxies, cosmic structures and much more. Several pictures are given, and the article is medium in length.
Space Telescope Science Institute
Amazing Space: Hubble Deep Field Academy
At this site, students can become a Steller Statistician, Cosmic Classifier, Galactic Guide or a Universal Graduate by attending the Hubble Deep Field Academy--and entering information in their Hubble Academy Log (HAL), which is assessed...
NASA
Nasa Star Child: What Is a Light Year and How Is It Used?
This is a definition and example of how distance is measured in astronomy, such as the distance between our earth and the stars.